WO2013065816A1 - 椅子 - Google Patents

椅子 Download PDF

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Publication number
WO2013065816A1
WO2013065816A1 PCT/JP2012/078455 JP2012078455W WO2013065816A1 WO 2013065816 A1 WO2013065816 A1 WO 2013065816A1 JP 2012078455 W JP2012078455 W JP 2012078455W WO 2013065816 A1 WO2013065816 A1 WO 2013065816A1
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WO
WIPO (PCT)
Prior art keywords
lumbar support
guide
support
main body
portions
Prior art date
Application number
PCT/JP2012/078455
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
アレキザンダー ハーフォード
磯貝　義徳
Original Assignee
株式会社岡村製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2011242756A external-priority patent/JP5893894B2/ja
Priority claimed from JP2011242752A external-priority patent/JP5917887B2/ja
Priority claimed from JP2011242753A external-priority patent/JP5882684B2/ja
Application filed by 株式会社岡村製作所 filed Critical 株式会社岡村製作所
Priority to CN201280054034.8A priority Critical patent/CN104023593B/zh
Priority to US14/355,931 priority patent/US9155393B2/en
Priority to EP12846202.5A priority patent/EP2774512B1/en
Publication of WO2013065816A1 publication Critical patent/WO2013065816A1/ja

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
    • A47C7/462—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs adjustable by mechanical means

Definitions

  • the present invention relates to a chair having a lumbar support attached to the backrest so as to be movable in the vertical direction.
  • the lumbar support As a chair with a lumbar support attached to the backrest, the lumbar support has a body part that faces in the left-right direction, a pair of left and right connecting parts that hang down from the lower ends of both side parts, and outward from the lower side edge of both connecting parts.
  • a gripping portion that extends to the back of the back frame (backrest body), with both gripping portions penetrating both sides of the back frame (backrest body) and supported so that the vertical position can be adjusted (see, for example, Patent Document 1), lumbar support
  • the left and right sides of the rear surface of the main body part are composed of a main body part facing left and right and a pair of left and right operation parts that are suspended from the lower ends of both side parts and that have a knob part facing outward at the lower end.
  • back frame From the lower center part of the back frame (back frame), which is supported by a bracket provided on the inner side surface of the left and right side members of the back frame (back frame) so that the vertical position can be adjusted (see, for example, cited document 2)
  • a bracket provided on the inner side surface of the left and right side members of the back frame (back frame) so that the vertical position can be adjusted (see, for example, cited document 2)
  • Standing run There is a bar support supporting portion in which the center portion in the left-right direction of the lumbar support main body is attached so that the vertical position can be adjusted (for example, see Patent Document 3).
  • an upper and lower guide member having a shape along the bending of the backrest is attached to the backrest, and the lumbar support can be moved along the upper and lower guide members. Supports that are supported on a lower part of the support at a position below the back bending point are vertically disclosed.
  • JP 2008-119217 A Japanese Patent No. 4575233 Japanese Patent No. 4133067 JP 2010-063820 A JP 2011-103933 A
  • the lumbar support of the chair described in Patent Document 1 is a pair of left and right pairs of relatively large lateral dimensions at the lower ends of both sides of the main body, and the shape of the main body is a horizontally long rectangle having the same vertical dimension. Since the portion is formed in a continuous U shape with the front view facing downward, it is difficult to effectively elastically deform the main body portion rearward, and the effective support area of the main body portion supporting the waist portion is small. Therefore, the entire waist cannot be comfortably supported, and the effect as a lumbar support is small.
  • the left and right grips which also serve as the lumbar support, are supported by the both sides of the back frame in the lower part away from the main body, when the backrest is reclining, When a load is applied, a large torsional load acts on the gripping part, and the gripping part may be damaged by long-term use.
  • the lumbar support for a chair described in Patent Document 3 is such that the lumbar support main body is supported by a lumbar support support portion that stands up from the lower center portion of the back frame in the inside surrounded by the back frame. There is a problem that the left and right lengths of the support body are limited and the waist cannot be supported in a wide range. In addition, since a pair of left and right operating handles are provided on both sides of the upper end of the lumbar support main body, the operability when operating the grips in the seated state is poor.
  • the lumbar support of the chair described in Patent Documents 1 and 2 is supported at only two places on the left and right sides of the back frame, and the lumbar support described in Patent Document 2 is raised from the back frame. Since the lumbar support support part supports the lumbar support at only one central part in the left and right direction, the left and right grip parts are evenly adjusted when the left and right grip parts are operated to adjust the vertical position of the lumbar support. If force is not applied to move up and down, the lumbar support may sway in the left-right direction and may not be able to move up and down smoothly.
  • the movement locus of the lumbar support becomes only one direction, that is, the vertical direction, and becomes linear. For this reason, the lumbar support cannot be moved up and down along the curved portion of the back frame, and the rear surface of the lumbar portion may strike the front surface of the lumbar support, which may cause discomfort to the seated person.
  • the locus can be controlled so that the lumbar support moves forward and upward even when the bending point is exceeded.
  • the entire lumbar support becomes easier to move backward as it moves upward. For this reason, the lumbar support cannot push the back strongly and it is difficult to obtain a desired supporting force.
  • the present invention has been made in view of the above problems, and the lumbar support main body can be effectively elastically deformed rearward, and the waist can be supported comfortably by increasing the effective support area of the waist, and It is a first object of the present invention to provide a chair provided with a lumbar support so that the lumbar support body can be stably supported by the back frame and the operability of the operation section can be improved.
  • the second purpose is to move the lumbar support body up and down stably and smoothly with the movement trajectory along the curved part even if the lower part of the back frame is curved so as to protrude forward,
  • a third object is to provide a chair that can optimally control the movement trajectory of the lumbar support and exhibit a desirable large support force.
  • the above-mentioned problems are solved as follows.
  • the lumbar support has a lower edge at the center in the left-right direction
  • the lumbar support body that is gradually reduced in size from the left and right ends toward the center, and the both sides of the lumbar support body are vertically separated from each other by curving in a circular arc shape so as to protrude upward
  • the lower edge of the center portion in the left and right direction of the lumbar support body is curved in an arc shape so as to protrude upward, and the vertical dimension of the lumbar support body gradually decreases from the left and right ends toward the center portion. Therefore, the central part in the left-right direction where the lumbar part (lumbar vertebrae) of the seat sits down is easily bent backward, and the lumbar part can be comfortably supported without a sense of incongruity.
  • the lumbar support main body is stably supported at four points on the guide parts of the left and right side frame rods by the four mounting parts provided on both sides of the lumbar support main body, thus preventing the lumbar support main body from wobbling in the horizontal direction.
  • the left-right width of the lumbar support main body is made substantially equal to the dimension between the opposing surfaces of the left and right side frame ridges, and the four attachment portions are located outside the side edges of the lumbar support main body. It protrudes in the direction and is supported by the guide portion of the side frame rod.
  • the entire lumbar support main body is easily elastically deformed rearward, and the effective support area for supporting the rear surface of the waist is increased, so that the entire waist can be comfortably supported.
  • the operating member can be moved in the vertical direction by the guide portion at the lower part of the side frame ridge so that the grip provided on the operation member protrudes from the outer surface of the side frame ridge.
  • the lower mounting portion is projected outward at a corner portion where the side edge and the lower edge of the lumbar support body intersect.
  • the position of the operating member linked to the lower mounting portion is lower than the central portion of the lumbar support main body, and the position of the hand operating the operating member in the seated state is also closer to the lower side. Therefore, the operability of the operation member is further improved.
  • a vertical concave groove opened forward is provided in front of the side frame ridge, and the upper mounting portion can be moved in the concave groove.
  • a guide member to be supported and guided is mounted so as to be detachable from the front.
  • the upper mounting portion can be easily supported by the side frame rod and guided in the vertical direction only by mounting the guide member in the concave groove of the side frame rod. Moreover, attachment / detachment of the upper attachment part to the side frame can be easily performed from the front.
  • the lower mounting portion is provided with a rear piece, and this rear piece can be attached and detached from the front to the inner end of the operation member facing in the left-right direction. Work together.
  • the upper and lower attachment portions can be easily supported by the side frame so as to be detachable from the front.
  • the lower portions of the left and right side frame ridges are provided with curved portions protruding forward in a side view, and the four lumbar support main body provided on both side portions are provided.
  • the upper left and right mounting portions are guided so as to be movable obliquely rearward and upward by the guide portions above the curved portions in the left and right side frame ridges, and the lower left and right mounting portions are The guide portion below the curved portion is guided so as to be movable forward and obliquely upward.
  • the movement trajectory of the lower and upper parts of the lumbar support body can be made different.
  • the lower part of the lumbar support body is directed diagonally forward and upward from below.
  • the upper part moves from the lower side to the upper side obliquely rearward.
  • it can be moved with a movement trajectory along the curved portions of the left and right side frame ridges, so that the rear surface of the lumbar portion of the seated person strikes the lumbar support body. It is possible to comfortably support the lower back without feeling uncomfortable.
  • a guide portion in the vertical direction is provided in the guide portion below the curved portion in the left and right side frame ridges, and the operation member is provided by the guide hole so that the grip portion provided on the side frame It protrudes from the outer side surface of the collar, is supported so as to be movable in the vertical direction, and the inner part protruding inward from the guide part of the operation member is linked to the lower left and right attachment parts.
  • the operating member can be guided by the vertical guide holes provided in the guide portions of the left and right side frame ridges and can be stably moved in the vertical direction, and the operating member can be operated in the seated state. Since the position of the hand is closer to the lower side, the operability of the operation member is improved.
  • a chair including a lumbar support that can comfortably support the waist and can be stably supported by the side frame of the back frame.
  • FIG. 4 is an exploded front view of a lumbar support body, a backrest support frame, a cover member attached to the backrest support frame, and an operation member. It is an expansion disassembled perspective view of the side edge part of a lumbar support main body, a cover member, and an operation member.
  • FIG. 5 is an enlarged cross-sectional end view taken along line XI-XI in FIG. 4. Similarly, it is an XII-XII line enlarged transverse end view.
  • FIG. 6 is an enlarged vertical front view taken along line XII-XII in FIG. 5.
  • FIG. 4 is an enlarged perspective view of a side frame rod and a guide member attached thereto.
  • FIG. 5 is an enlarged vertical side view taken along line XVI-XVI in FIG. 4.
  • FIG. 1 shows the state which attached the guide member to the recessed part.
  • FIG. 1 shows the state which attached the guide member to the recessed part.
  • FIG. 6 is an enlarged perspective view of a portion of an inner shell and a lumbar support and a guide member. It is a perspective view which decomposes
  • FIG. 1 is a front view of a first embodiment of a chair having a lumbar support according to the present invention
  • FIG. 2 is a side view of the same.
  • the chair has a leg 3 having five radial rods 2 each having a caster 1 at the tip, and a telescopic member that is erected at the center of the leg 3 and accommodates a gas spring (not shown).
  • a vertical pillar 4 a front base 5 with the rear end fixed to the upper end of the base 4, a seat 6 supported by the base 5, and a shaft 7 with the front end facing the left-right direction
  • a back support 8 pivotally attached to the support base 5, a back rest 9 supported on the rear upper part of the back support 8, and a lumbar support 10 provided at an intermediate portion in the vertical direction of the back support 9, It has.
  • the support base 5 has a substantially rectangular box shape in a plan view that is long in the front-rear direction with the opening of the upper surface closed by a cover, and the backrest is always directed forward via a backrest support 8 inside.
  • the urging means for urging the urging force and the adjusting means for adjusting the urging force of the urging means are accommodated.
  • biasing means and adjustment means are not directly related to this invention, those specific structures and detailed description are abbreviate
  • the backrest support 8 includes a lateral frame 11a and a pair of left and right upright frames 11b and 11b connected to both end portions thereof. It consists of a pair of left and right backrest support ridges 12 and 12 facing in the front-rear direction, the rear end portion of which is fixed to the horizontal frame 11a of the sag support frame 11, and they are made of, for example, aluminum or an alloy thereof (see FIG. 3, 4, and 7, the backrest support is not shown).
  • the horizontal frame 11a is gently curved in an arc shape so that a central portion in the left-right direction protrudes rearward in a plan view, and both side portions are inclined obliquely upward in a front view.
  • the left and right standing frames 11b are inclined obliquely forward and upward so as to face the same direction as the lower part of the side frame rod 19 of the back frame 17 described later.
  • the left and right backrest support rods 12 are inclined forward and downward, and the center portion is gently curved downward.
  • the front end portions of the left and right backrest support rods 12 are pivotally attached to both side portions of the support base 5 so as to be rotatable in the vertical direction by the shaft 7.
  • the rear ends of the left and right backrest support rods 12 are fixed to the horizontal frame 11a of the backrest support frame 11 as follows. First, the rear end portions of the left and right backrest support rods 12 are formed in a pair of left and right fitting holes 13 and 13 (see FIGS. 4 and 7) formed on the left and right sides of the horizontal frame 11a. Fits without any problem. Next, bolts 15 and 15 are inserted from above into two mounting holes 14 and 14 provided on the upper surface at positions corresponding to the left and right fitting holes 13 in the horizontal frame 11a, and the lower ends of both bolts 15 are The backrest support rod 12 is tightened by being screwed into two left and right female screw holes 16, 16 provided at the rear end of the backrest support rod 12. As a result, the backrest support 8 is formed on the lateral frame 11a of the backrest support frame 11 in which the rear end portions of the left and right backrest support rods 12 are firmly fixed.
  • the backrest 9 includes a back frame 17 made of a hard synthetic resin having a substantially rectangular frame shape on the front surface, and a tension member 18 stretched on the surface of the back frame 17, that is, the front surface (FIGS. 3 to 6).
  • a back frame 17 made of a hard synthetic resin having a substantially rectangular frame shape on the front surface
  • a tension member 18 stretched on the surface of the back frame 17, that is, the front surface (FIGS. 3 to 6).
  • the back frame 17 has a pair of left and right side frame rods 19 that are curved in a gentle arc shape so that a portion slightly below the center in the vertical direction protrudes forward in a side view.
  • 19 and the upper ends of the upper frame ridges 20 are connected to each other, and the upper frame ridge 20 that is curved in a gentle arc shape so that the central portion in the left-right direction protrudes rearward in plan view, and the lower ends of the side frame ridges 19, 19
  • a lower frame rod 21 that connects the portions substantially linearly, and tension members 22 and 23 of a tension member 18 that are attached to the front surface and both side end portions of the lower frame rod 21 with bolts 28 and nuts 30.
  • the portions below the curved portion C of the left and right side frame collars 19 are inclined in the same direction as the upright frame 11 b of the backrest support frame 11.
  • a concave groove 24 that opens forward is formed along the longitudinal direction on the front surfaces of the left and right side frame rods 19, 19 and the lower frame rod 21.
  • the groove width of the concave groove 24 of the both side frame rods 19 is gradually increased downward from the central portion in the vertical direction (see FIG. 4), and the concave groove 24 is a curved portion of the side frame rod 19 In the vicinity of C, it is partitioned by lateral ribs 25, 25 that are spaced apart vertically.
  • the front and rear dimensions of the inner piece 19a and the outer piece 19b facing each other across the concave groove 24 in the both side frame rods 19 are such that the front edge of the outer piece 19b protrudes more forward than the front edge of the inner piece 19a.
  • the front-rear dimension of 19b is made larger than that of the inner piece 19a (see FIG. 17).
  • the left and right upright frames 11b of the backrest support frame 11 described above are fitted to the outer side surfaces of the left and right side frame rods 19, 19 below the curved portion C.
  • a fitting recess 26 is formed in the opening.
  • the fitting recesses 26 provided in the left and right side frame rods 19, 19 are fitted into the left and right standing frames 11b, 11b of the horizontal frame 11a from above.
  • the lower frame 21 of the lower frame 17 of the back frame 17 is brought into contact with the upper surface of the horizontal frame 11 a, and the back frame 17 is temporarily supported by the back support frame 11.
  • the bolts 28 and 28 inserted into the pair of left and right mounting holes 27 and 27 provided in the back surface of the fitting recess 26 of the left and right standing frames 11b and the left and right side frame rods 19 are connected to the left and right side frames.
  • the bolts 28 and 28 inserted into the pair of left and right mounting holes 27 and 27 provided in the back surface of the fitting recess 26 of the left and right standing frames 11b and the left and right side frame rods 19 are connected to the left and right side frames.
  • the square nuts 30 and 30 fitted to the upper and lower nut holding parts 29 and 29 provided on the inner surface of the inner piece 19a The lower part of the collar 19 is fixed to the left and right standing frames 11b (see FIG. 13).
  • the bolts 32 and 32 inserted from below into a pair of left and right mounting holes 31 and 31 provided at the center in the left and right direction of the horizontal frame 11a are rotated by ribs in the concave groove 25 of the lower frame rod 21.
  • the fixed square nuts 30 and 30 are screwed and tightened to fix the lower frame rod 21 and the horizontal frame 11a.
  • the back frame 17 is firmly fixed to the backrest support frame 11 with the lower part thereof fitted into the backrest support frame 11.
  • cover members 33 and 33 are fitted on the outer surfaces of the left and right standing frames 11b and 11b.
  • the cover member 33 has a vertically long plate-like upward piece 34 with a slightly larger thickness in the left-right direction except for the upper end portion, and a back support frame at the lower end thereof.
  • a stop piece 36 projects inwardly.
  • the upward piece 34 and the above-described standing frame 11b to which the upward piece 34 is attached move the upper and lower attachment portions 42 of the lower portion of the lumbar support main body 41 described later through the operation member 43 described later and the operation member 43 described later. It also serves as a guide part for supporting and guiding it so as to be movable in the direction.
  • the cover member 33 is fitted into the recess 37 formed in the back support frame 11, and the locking claw 34 a at the upper end of the upward piece 34 is, as shown in FIG.
  • the side frame collar 19b is locked to the inner surface of the downwardly facing piece 38 of the upper edge of the fitting recess 26 and, as shown in FIG. 11, is locked to the left and right through hole 39 provided near the base of the standing frame 11b.
  • the piece 36 is fitted, the locking claw 36a at the tip thereof is elastically engaged with the locking step 40 at the back of the through hole 39, and the downward locking claw 35a of the inward piece 35 is It engages with a locking step (not shown) provided at the lower end of 37.
  • the cover member 33 is attached to the concave portion 37 formed on the outer side surface of the back support frame 11 so as to cover the heads of the upper and lower bolts 28 to which the back frame 17 is fixed. It can also be removed.
  • the lumbar support 10 includes a synthetic resin lumbar support body 41 that can be elastically deformed moderately in the front-rear direction, upper left and right side edges, and both side edges. And four left and right mounting portions 42 that protrude outwardly so as to be located on the diagonal line of the lumbar support main body 41 at the left and right corners where the lower edge and the lower edge intersect, A pair of left and right operation members 43 linked to the left and right mounting portions 42 are provided, and are mounted in the vicinity of the curved portion C of the left and right side frame rods 19 so as to be movable in the vertical direction.
  • Each mounting portion 42 is composed of a short outwardly facing piece 42a facing outward and a backwardly facing piece 42b continuously provided at the tip thereof. Note that the pair of left and right upper mounting portions 42 are continuously provided slightly below the upper end of the lumbar support main body 41.
  • the lumbar support body 41 is gently curved in an arc shape so that the central portion in the left-right direction protrudes backward, and is gently curved in an arc shape so that the lower edge of the central portion protrudes upward.
  • the vertical dimension is gradually reduced from the left and right ends toward the central part, and the vertical cross-sectional shape is curved in an arc shape so that the central part in the vertical direction protrudes forward.
  • the back frame 19 has a substantially horizontally long rectangular shape in front view which is substantially equal to the dimension between the opposing surfaces of the side frame ribs 19b.
  • the left and right operation members 43 include a grip portion 44 made of a synthetic resin and a linkage member 45 with a lumbar support main body 41 made of a metal plate.
  • An inward protruding piece 44a having a small front and rear thickness is integrally formed on the inner side surface of the grip portion 44, and the inwardly protruding piece 44a opens inward so that the outer portion of the linkage member 45 can be fitted thereto.
  • a vertically slit fitting hole 46 is formed.
  • the outer half of the inwardly projecting piece 44a and the lower part of the front half are thick, and the front and rear surfaces of the inwardly projecting piece 44a of the part where the inner and outer thick parts 47, 47 face each other are slits that face in the vertical direction. Concave grooves 48, 48 are formed (see FIG. 12).
  • the linking member 45 has a vertical plate shape that is longer in the left-right dimension than the inwardly projecting piece 44a and can be slightly elastically deformed in the front-rear (plate thickness) direction.
  • An engagement piece 45a having a small vertical dimension that can be engaged with an engagement recess 57, which will be described later, is provided so as to protrude from the tip of the linking member 45 adjacent to the engagement piece 45a.
  • a rectangular linkage hole 49 is formed that opens in the front-rear direction in which the rear piece 42b of the lower mounting portion 42 is slidably fitted.
  • the left and right width of the linkage hole 49 is larger than the left and right dimensions of the rear piece 42b so that the rear piece 42b can move only in the left and right direction. Is not transmitted to the operation member 43 through the rear piece 42b.
  • the front surface of the locking hole 50 that is formed on both front and rear surfaces of the inwardly projecting piece 44a slightly closer to the front end and communicates with the fitting hole 46.
  • the protrusion 51 having a low height projecting from the front surface of the central portion in the left-right direction of the linking member 45 is engaged with the one on the side, the linking member 45 is detached from the fitting hole 46 of the inward protruding piece 44a. Is to be prevented.
  • the inwardly projecting piece 44 a of the grip portion 44 is movable in the vertical direction on the upward piece 34 of the cover member 33 and the above-described standing frame 11 b.
  • the upper and lower guide holes 52 and 52 to be fitted are formed to face each other so as to penetrate the inner and outer peripheral surfaces of the side frame collar 19 of the back frame 17, that is, in the left and right direction.
  • On the inner opening edge excluding the lower end portion of the guide hole 52 inwardly extending ridges 53, 53 that protrude in the vertical direction are provided so as to face each other in the front-rear direction.
  • the guide hole 52 is also inclined so as to face obliquely forward and upward.
  • the guide hole 52 formed in the upward piece 34 and the upright frame 11b constitutes a part of the guide portion that guides the operation member 43 and the attachment portion 42 of the lower portion of the lumbar support main body 41 linked thereto.
  • the guide hole 52 as described above may be provided in the outer piece 19b having a thick wall frame 19.
  • both inwardly protruding ridges 53 The dimension between the opposing surfaces of both inwardly protruding ridges 53 is substantially equal to the thickness of the thin portion 54 of the inwardly protruding piece 44a excluding the thick portions 47 and 47, and both inwardly protruding ridges 53 have inwardly protruding pieces.
  • the concave grooves 48 on both front and rear sides of 44a are slidably fitted.
  • the operation member 43 is moved upward, and the concave grooves 48, 48 on both front and rear sides of the inwardly projecting piece 44a are fitted to the front and rear inwardly protruding ridges 53, 53.
  • the operation member 43 is prevented from being removed from the guide hole 52 and is restricted from moving in the left-right direction.
  • the operation member 43 is guided by the inward protrusion 53 and the guide hole 52 and moved in the up-down direction. Can do.
  • the lumbar support main body 41 is located at the lower limit so that the operation member 43 does not come out of the guide hole 52, the operation member 43 linked to the guide member 52 is below the lower end of the inward protrusion 53. It doesn't move in.
  • the lower limit position of the lumbar support 10 at this time is determined by a guide member 58 which will be described later, which is attached to the side frame rod 19.
  • the lumbar support main body 41 and the left and right operation members 43 are connected to the lumbar support main body in the connection hole 49 of the connection member 45 of the operation member 43.
  • the left and right attachment portions 42 of the lower part 41 in 41 are connected to each other by fitting them detachably from the front. Therefore, when the left and right operation members 43 are operated in the vertical direction, the lumbar support main body 41 moves up and down in conjunction with it, and even if the lumbar support main body 41 bends in the front-rear direction, the load acts directly on the operation member 43.
  • a plate-like ridge piece 56 facing in the vertical direction is projected forward so as to be substantially orthogonal to the linking member 45 of the operation member 43.
  • a plurality of upper and lower engaging recesses 57 that are concave in a forward-facing side view are formed at regular intervals in the vertical direction.
  • the vertical position of the lumbar support 10 is adjusted step by step. It can be adjusted with a feeling.
  • the linking member 45 since the linking member 45 has a plate shape substantially perpendicular to the vertical direction, it is easily elastically deformed in the thickness direction, that is, the front-rear direction. Even if the vertical width is relatively large and the engagement force is increased, the engagement piece 45a can be selectively engaged with the engagement recess 57 with a light operation force. In addition, it is preferable that the vertical width of the engagement piece 45a and the engagement recess 57 is substantially equal so that the lumbar support 10 does not rattle in the vertical direction.
  • a pair of left and right mounting portions 42, 42 on the upper side of the lumbar support main body 41 are supported so as to be movable in the vertical direction in the concave groove 24 slightly above the curved portion C in the left and right side frame rods 19, 19.
  • Guide members 58 and 58 are mounted as follows.
  • the left and right guide members 58 should be along the width dimension of the concave groove 24.
  • an inward piece 58a whose left and right dimensions are gradually narrowed upward, a rear piece 58b projecting from the outer edge thereof, and a bottom piece connected to the lower ends of the inward piece 58a and the rear piece 58b 58c, and the transverse plane has an inward L-shape.
  • the backward piece 58b is curved in an arc shape so as to be in surface contact with the curved inner surface of the outer piece 19b of the side frame collar 19.
  • a notch 59 is provided at the lower end of the rear piece 58b so as not to interfere with the bolt 28 for fixing the back frame 17 to the back support frame 11 described above.
  • An engagement groove 61 having a U-shaped cross section opening inwardly and rearwardly is formed on the rear surface of the thick portion 60 connected to the upper ends of the inwardly facing piece 58a and the backwardly facing piece 58b.
  • a pair of upper and lower engaging protrusions 62 and 62 project outward from the front end portion of the outer surface of the rearward piece 58b.
  • the guide member 58 In order to attach the guide member 58 to the side frame rod 19, the guide member 58 is placed in the concave groove 24 of the side frame rod 19 so that the lower surface of the bottom piece 58 c abuts the upper surface of the rib 25 in the concave groove 24.
  • the upper engaging groove 61 is engaged with the protrusion 64 projecting from the outer surface of the inner piece 19a of the side frame rod 19 and positioned in the vertical direction.
  • the engaging protrusions 62 and 62 are engaged with a pair of upper and lower concave portions 63 and 63 formed on the inner surface of the front end portion of the outer piece 19 b of the side frame rod 19.
  • the guide member 58 is mounted in the concave groove 24 so as not to be removed forward, and can be removed forward if necessary.
  • the front surface of the guide member 58 is in contact with the rear surface of the tension member 18 stretched on the back frame 17, it is possible to reliably prevent the guide member 58 from rattling in the front-rear direction.
  • the mounting position of the guide member 58 is such that the lumbar support 10 stops at the lower limit position when the rearward piece 42b of the mounting portion 42 on the upper side of the lumbar support main body 41 comes into contact with the upper surface of the bottom piece 58c.
  • the member 43 is also set to stop at the lower limit position where it does not leave the guide hole 52 of the upper piece 34 of the cover member 33.
  • the outwardly facing piece of the mounting portion 42 on the upper side of the lumbar support main body 41 is provided between the opposing surfaces of the rear surface of the inwardly facing piece 58 a of the guide member 58 and the front end of the inner piece 19 a of the side frame rod 19.
  • a gap S slightly smaller than the thickness of 42a is formed. Accordingly, by positioning the pair of left and right mounting portions 42, 42 on the upper side of the lumbar support main body 41 in the recessed grooves 24 behind the left and right guide members 58, 58, The portion is guided by the pair of left and right guide members 58 and the inner piece 19a, and can move in the vertical direction.
  • the left and right operation members 43 are first attached to the lower portions of the left and right side frame rods 19 in the manner described above.
  • the rear surface of the side end portion of the lumbar support main body 41 faces the front surface of the side frame rod 19 via a required gap, and when the lumbar support main body 41 bends backward, The rear surface of the side end is in contact with the front surface of the side frame collar 19. Even if the lumbar support main body 41 bends in the front-rear direction, the rear piece 42b only slides in the front-rear direction in the link hole 49, so that the entire lumbar support main body 41 including the link member 45 is provided. The risk of bending load from is small.
  • the left and right guide members are moved together with the operation member 43 to the position where the operation member 43 is not detached from the guide hole 52 of the upper piece 34 of the cover member 33.
  • 58 is mounted in the concave groove 24 of the side frame rod 19 in the manner described above (see FIG. 17).
  • the assembly of the lumbar support 10 is completed.
  • the lumbar support 10 is supported at four points by the left and right side frame rods 19 by the four attachment portions 42 provided at the upper and lower end portions on both side edges of the lumbar support main body 41.
  • the outwardly facing piece 42 a of the upper mounting portion 42 is in contact with or close to the rear surface of the inwardly facing piece 58 a of the guide member 58, the upper mounting portion 42 is not detached forward from the guide member 58. Even after the tension member 18 is stretched on the back frame 17, the lumbar support body 41 and the guide member 58 can be mounted from the rear side of the back frame 17 by bending the tension member 18 forward. .
  • the attachment portions 42 on both lower sides linked to the linking member 45 and the lumbar support main body 41 integrated therewith are interlocked in the vertical direction.
  • the vertical position of the lumbar support 10 can be adjusted.
  • the engagement piece 45a at the tip of the linking member 45 selectively engages with a plurality of upper and lower engagement recesses 57 of the protrusion piece 56 provided in the lower groove 24 in the left and right side frame rods 19.
  • the vertical position of the lumbar support 10 can be adjusted stepwise and with a sense of moderation.
  • the left and right widths of the lumbar support body 41 are substantially equal to the dimension between the opposing surfaces of the left and right side frame collars 19 and both side edges of the lumbar support body 41 are arranged. Since the four mounting portions 42 projecting from the left and right sides are substantially supported by the left and right side frame rods 19, the lumbar support main body 41 as a whole can be elastically deformed rearward and can be effectively supported to support the rear surface of the waist. The area is large and the entire waist can be comfortably supported.
  • the four upper, lower, left, and right mounting portions 42 project outward from the upper and lower ends of both side edges so as to be close to the lumbar support main body 41, so that the lumbar support main body 41 bends backward.
  • the lumbar support main body 41 is provided on the left and right sides of the back frame 17 via the four mounting portions 42 located on the diagonal lines. Since the side frame rod 19 is stably supported at four points, the lumbar support body 41 can be smoothly moved up and down while preventing wobbling in the left-right direction.
  • the shape of the lumbar support main body 41 is gently curved in an arc shape so that the lower end of the central portion protrudes upward in a front view, and its vertical dimension gradually decreases from the left and right ends toward the central portion. Therefore, the center part in the left-right direction where the lumbar part (lumbar vertebra) of the lumbar support main body 41 strongly hits easily becomes bent backward, and the lumbar part can be comfortably supported without a sense of incongruity.
  • the lower left and right attachment portions 42 are projected at corners where the lower edge of the lumbar support main body 41 curved in an arc shape and the both side edges intersect, and below the lower edge of the central portion of the lumbar support main body 41. Since it is located, the left and right operation members 43 linked to the both attachment portions 42 are also closer to the lower side of the lumbar support main body 41 that can easily reach the seated person, and the operability of the operation member 43 is improved.
  • the left and right attachment portions 42 and the operation member 43 linked to the lower portion of the lumbar support main body 41 can be moved obliquely forward and upward by a portion of the left and right side frame rods 19 facing diagonally forward and below the curved portion C. Further, the upper left and right attachment portions 42 can be moved rearward and upward by a guide member 58 attached to a portion of the left and right side frame ridges 19 facing slightly upward and rearward of the curved portion C. Since it is supported, the movement locus of the lower part and the upper part of the lumbar support main body 41 can be made different.
  • the lower portion of the lumbar support main body 41 becomes a trajectory moving from the lower side to the diagonally forward upper side, and the upper part is also directed from the lower side to the diagonally rearward upper side. It becomes a trajectory to move.
  • the vertical position of the lumbar support body 41 when adjusted, it can be moved with a movement trajectory along the curved portion C of the left and right side frame rods 19, so that The rear surface does not strike unevenly, and the waist can be comfortably supported without a sense of incongruity.
  • the upper and lower support positions of the lumbar support main body 41 with respect to the side frame rod 19 are at the lower and upper portions of the curved portion C of the side frame rod 19, and the upper, lower, left and right mounting portions 42 of the lumbar support main body 41 are Since the lumbar support 10 moves substantially linearly on different trajectories, the vertical position adjustment of the lumbar support 10 can be performed smoothly without being obstructed by the curved portion C of the side frame rod 19.
  • the operating member 43 In attaching the lumbar support main body 41 to the back frame 17, the operating member 43 is first attached to the left and right side frame rods 19, and then the connecting hole 49 that opens in the front-rear direction of the connecting member 45 of the operating member 43 is formed in the lower part.
  • the left and right mounting portions 42 of the left and right mounting portions 42 are fitted from the front, and the upper left and right mounting portions 42 are fitted to the concave grooves 24 of the side frame rod 19 from the front, Since it is only necessary to mount the guide member 58 in the groove 24 and prevent the upper mounting portion 42 from being removed, the operation of mounting the lumbar support body 41 to the back frame 17 and the operation with the mounting portion 42 of the lumbar support body 41 are performed.
  • the linking operation with the member 43 can be easily performed from the front of the back frame 17 with the lumbar support main body 41 in a normal posture. Wear is also easy.
  • the lower mounting portion 42 of the lumbar support main body 41 and the operation member 43 are separated from each other, and the rear piece 42a of the lower mounting portion 42 of the lumbar support main body 41 is connected to the connection hole 49 of the connection member 45 of the operation member 43.
  • the engagement recess 57 for adjusting the vertical position of the lumbar support main body 41 in stages is fitted to the upward piece 34 as a guide part for guiding the operation member 43 and the upright part.
  • the concave groove 48 provided in the inward protrusion piece 44a of the operation member 43 is fitted into the inward protrusion 53 provided in the guide hole 52 of the upward piece 34.
  • the rear piece 42b of the attachment portion 42 linked to the linkage hole 49 of the operation member 43 is fitted so as to be movable only in the front-rear direction, the rear piece 42b of the lumbar support main body 41 is operated by the rear piece 42b. It is possible to prevent the member 43 from coming off.
  • the rearward piece 42 b of the mounting portion 42 of the lumbar support main body 41 is fitted into the linkage hole 49 provided in the operation member 43 and opening in the front-rear direction, so that the mounting portion 42 of the lumbar support main body 41 is fitted.
  • the linking member on the inner side of the operation member 43 is an inward rod (not limited to a circular cross section) and the lumbar support body. If the recessed part opened rearward is provided in the backward piece 42b of the attachment part 42 of 41, and this recessed part is fitted to the inner side part of the rod from the front, the operation member 43 is first moved to the side frame ridge as described above.
  • the rear piece 42 b of the lumbar support main body 41 can be easily fitted and linked to the rod from the front.
  • a retaining washer for preventing the operating member from moving outward and coming off from the side frame rod 19 is fitted to the tip of the rod inward of the recess. Is good.
  • the upper piece 34 of the cover member 33 and the upright frame 11b of the back support frame 11 to which the cover member 33 is attached are used as guide portions, and the operation member 43 and the lower portion of the lumbar support main body 41 linked thereto are used.
  • the mounting portion 42 is supported and guided so as to be movable in the vertical direction.
  • the outer piece of the side frame collar 19 that is thick. 19b may be a guide portion having a guide hole.
  • FIGS. a chair according to a second embodiment in which the backrest is a cushion type will be described with reference to FIGS.
  • the left and right are designated when the chair is viewed from the front.
  • 18 is a right side view of the chair of the second embodiment, and
  • FIG. 19 is a front view of the same.
  • This chair is fixed to a leg 3 having five leg rods 2 having a caster 1 at the tip, a leg 4 standing at the center of the leg 3, and an upper end of the leg 4.
  • the backrest 100 is supported by the backrest support frame 77.
  • FIG. 20 (a) and 20 (b) are a front view and a right side view of the backrest 100, respectively, and FIG. 21 is an exploded perspective view of the backrest 100 and the lumbar support 200.
  • the backrest 100 includes an inner shell 110, a guide member 120, a backrest support body 130, a cover member 140, a cushion material 150, and a skin material 160, which will be described later. It is assembled and formed in a form.
  • backrest 100 which is a superordinate concept, is used even when a part of the member constituting the backrest 100, for example, the inner shell 110 is meant. There is also a case.
  • the lumbar support 200 is attached to the backrest 100.
  • the lumbar support 200 is not included in the concept of the backrest 100, and is compared with this. explain.
  • FIG. 22 is a front view of the inner shell 110 and the guide member 120
  • FIG. 6 is a front view of the lumbar support 200, the backrest support 130, the cover member 140, and the gripping member 240.
  • the inner shell 110 has a substantially rectangular shape when viewed from the front, has a forwardly-shaped shape when viewed from the side, and has a gentle arc shape that protrudes backward when viewed from the top. There is no.
  • the front surface of the inner shell 110 is provided with a slightly wider side edge 111 at the left and right ends, an upper edge 112 at the upper end, and a lower edge 113 at the lower end.
  • Three large vertical ribs 114 a are provided between the left and right side edge portions 111, and three large horizontal ribs 115 a are provided at equal intervals in the upper half of the inner shell 110.
  • a first vertical small rib 114b is provided between the side edge 111 and the large vertical rib 114a or between the adjacent large vertical ribs 114a.
  • horizontal first small ribs 115b are respectively provided between the three large horizontal ribs 115a and below the lowermost horizontal large rib 115a. Furthermore, in the lower half of the inner shell, vertical second small ribs 114c are provided between the vertical large ribs 114a and the vertical first small ribs 114b except for the vertical large ribs 114a at the center of the left and right.
  • a vertical guide protrusion 116 is provided between the vertical first small ribs 114b and the vertical second small ribs 114c.
  • inclined small ribs 114d, through holes 114e, and lateral second small ribs 115c are provided at appropriate positions.
  • Four bolt insertion holes 112a are provided between the upper edge 112 of the inner shell 110 and the top horizontal large rib 115a for mounting a headrest or the like as an optional member. The description is omitted because the present invention is not directly targeted.
  • the lower edge portion 113 is provided with a pair of bolt insertion notches 113a and nut housing portions 113b necessary for attaching the backrest support 130 to the inner shell 110, which will be described later.
  • the left and right side edge portions 111 are provided with a number of vertically elongated concave portions 111a in the upper half, and have a function of preventing displacement of the cushion material 150 disposed on the front surface of the inner shell 110 in addition to reinforcement. ing.
  • vertically long concave portions 111b, 111c, 111d are provided in three horizontal rows, and the outer two rows of concave portions 111b, 111c are divided into three in the vertical direction.
  • the section recesses 111b1, 111b2, 111c1, and 111c2 have substantially the same length in the vertical direction, but the lower section recesses 111b3 and 111c3 have a short length.
  • nut housing portions 111e and 111f are provided so as to be spaced apart vertically. Between these nut accommodating portions 111e and 111f, a sliding contact surface 111g in the vertical direction which will be described later is provided.
  • the guide member 120 is attached to the recesses 111c and 111d in two rows inside the side edge 111.
  • FIG. 24 is an enlarged perspective view of the left and right guide members 120
  • FIG. 25 is a perspective view showing a state in which the guide members 120 are attached to the recesses 111c and 111d
  • FIG. 26 shows the inner shell 110 and the lumbar support 200
  • 3 is an enlarged perspective view of a guide member 120.
  • the guide member 120 is a cover that is narrow and has a vertical guide portion 121 that curves slightly forward and has a stepped portion 122 provided below the guide portion 121.
  • the section 123 includes a fixing section 124 having a rectangular cross section provided continuously outside the guide section 121 and the cover section 123 in the left-right direction.
  • the fixing portion 124 is provided with an upward upper locking portion 125 at the upper end, a lower locking portion 126 having a downward locking claw 126a extending rearward at the lower end, and is vertically divided into three.
  • the guide member for causing the inner shell 110 to include the guide portion is an example shown in the embodiment, and is not limited thereto.
  • the structure of the guide portion is not particularly limited as long as it can guide and support the guide support portion 210 of the lumbar support 200 so that the guide support portion 210 cannot fall off and can move in the vertical direction. Further, the guide portion may be integrally formed when the inner shell 110 is formed.
  • FIG. 29 is a front view showing the right half portion of the inner shell 110.
  • FIG. 30 is longitudinal side views of aa, b, b, c, c, d, d, e, f, and g lines in FIG. 29, respectively.
  • 33, 34, 35, and 36 are partially enlarged views of (b), (e), (f), and (g) in FIG. 30, respectively.
  • FIG. 31 is a front view showing the right half portion of the inner shell 110.
  • FIGS. 32 (h), (i), (j), (k), and (l) are lines h to h in FIG. , I-i line, j-j line, k-k line, l-l line.
  • lines that should originally be indicated by broken lines are also indicated by solid lines in order to clarify the positional relationship.
  • the upper recessed portion 111c1 and the lower recessed portion 111c3 of the recessed portion 111c of the side edge 111 of the inner shell 110 to which the fixed portion 124 of the guide member 120 is fitted and fixed are respectively provided with the locked portion 111c4, 111c5 is provided.
  • the fixing portion 124 of the guide member 120 is fitted into the concave portion 111c of the side edge portion 111, and the locking claw 126a of the upper locking portion 125 and the lower locking portion 126 of the guide member 120 is locked to the locked portions 111c4 and 111c5, respectively.
  • the guide member 120 is attached to the side edge 111 in the form shown in FIG. At this time, the fixed portions 124a, 124b, 124c of the guide member 120 that are divided into three are fitted into the upper recess 111c1, the middle recess 111c2, and the lower recess 111c3, respectively.
  • the lumbar support 200 has a substantially horizontal rectangular shape having a lateral width similar to that of the inner shell 110, and forms a gentle arc shape that protrudes backward in plan view, It has a gentle arc that is convex forward.
  • a guide support portion 210 is provided at the upper portion and an operation support portion 220 is provided outward at the lower portion.
  • the upper left and right guide support portions 210 and the lower left and right operation support portions are provided.
  • the left and right side portions of the lumbar support 200 are supported by both side portions of the inner shell 110 by four points with the portion 220.
  • the guide support portion 210 has a vertical plane that is parallel to the vertical plane of the lumbar support 200 and a vertical width smaller than that of the lumbar support 200.
  • the guide support part 210 is movable between the front surface of the inner shell 110 and the guide part 121 of the guide member 120 attached as described above, so that it can move in the vertical direction. Supported by
  • sliding contact portions 230 are projected from the upper and lower portions, respectively.
  • the free end of the sliding contact portion 230 is provided with a sliding contact groove 230a that opens in the vertical direction and rearward direction, and the guide protrusion shown in FIG. 116 is loosely fitted in the sliding contact groove 230a so as to be slidable in the vertical direction (see FIG. 38).
  • FIG. 27 is an exploded perspective view showing an assembly form in which the operation support portion 220 of the lumbar support 200 is attached to the inner shell 110.
  • a recess 117a that opens outward and downward in the left-right direction is provided at the lower part of the left and right side portions of the inner shell 110, specifically, the lower part of the left and right side edge portions 111.
  • a vertical opening 117 that opens in the left-right direction is provided in the back wall 117b of the recess 117a.
  • the opening 117 includes an insertion opening portion 117c for inserting the operation support portion 220 of the lumbar support 200 into the opening 117, and the lumbar support 200 during normal use after the insertion.
  • the operation support portion 220 is provided with a moving opening portion 117d that is supported so as not to fall off and to be movable in the vertical direction.
  • the insertion opening portion 117c is provided in communication with the lower end of the moving opening portion 117d in the embodiment, but may be provided in communication with the upper end.
  • the insertion opening portion 117c includes a wide opening portion having an opening width L larger than the opening width W of the moving opening portion 117d.
  • a movement preventing part 117e for preventing the operation support part 220 of the lumbar support 200 from moving from the moving opening part 117d to the fitting opening part 117c is provided.
  • the opening of the communicating portion is provided.
  • a movement preventing portion 117e is formed by partially protruding the inner wall.
  • the operation support portion 220 of the lumbar support 200 is extended outward in the left-right direction, and has an opening 221 in the front-rear direction at the base, which is easily elastically curved.
  • An easy-to-bend portion 222 is formed, and an insertion port 220a into which a free end of a gripping member 210, which will be described later, can be inserted by bending the upper and lower ends inward and backward.
  • a spring member 223 having one end coupled to the operation support 220 and a free end 223a protruding forward is attached near the free end of the front surface of the operation support 220.
  • a sliding contact protrusion 224 is provided on the rear surface of the operation support part 220 so as to protrude rearward.
  • the operation support part 220 of the lumbar support 200 is inserted and supported in the opening 117 as follows.
  • one of the left and right operation support portions 220 of the lumbar support 200 for example, the right operation support portion 220 is inserted into the insertion opening portion 117c in the right opening 117 from the inside of the inner shell 110 as shown in FIG. It is inserted in the wide opening part.
  • the operation support portion 220 is moved upward in a state in which the free end portion 223a of the spring member 223 is in contact with the inner wall of the insertion opening portion 117c, and the narrow opening portion is utilized by utilizing the elastic deformation of the spring member 223. Is moved to the moving opening.
  • the operation support portion 220 once moved to the moving opening portion is prevented from moving to the fitting opening portion because the movement preventing portion 117e is provided.
  • the operation support portion 220 on the left side of the lumbar support 200 is appropriately bent using the above-described easily bendable portion 222 (see FIG. 23), and is similarly inserted into the left opening 117 of the inner shell 110. be able to.
  • the sliding contact surface 111g in the vertical direction is provided on the inner side in the left-right direction of the opening 117 on both the left and right sides of the inner shell 110.
  • the left and right operation support portions 220 of the lumbar support 200 are inserted into and supported by the left and right openings 117 of the inner shell 110 as described above.
  • the provided sliding contact protrusion 224 comes into contact with the sliding contact surface 111g and comes into sliding contact with the sliding contact surface 111g as the lumbar support 200 moves in the vertical direction.
  • the standing frame 131 in the backrest support 130 is fitted from below to the left and right recesses 117a provided with the opening 117 of the inner shell 110 (see FIG. 21).
  • the backrest support body 130 has a U-shape when viewed from the front, and standing frames 131 are erected on the left and right ends of the horizontal frame 132.
  • the front side of the horizontal frame 132 is provided with a pair of left and right connecting recesses 133 that are recessed into the rear, and each connecting recess 133 is provided with two bolt insertion holes 133a penetrating from above to the connecting recess 133. Has been.
  • the rear ends of a pair of backrest support frames 77 pivotally attached to the left and right of the support base 5 are fitted into the connection recess 133, and the bolt 133b is inserted through the bolt insertion hole 133a from above.
  • the backrest support body 130 is fixed to the backrest support frame 77 by being fastened to the threaded portion 77 a because it is provided at the rear end of the backrest support frame 77.
  • the standing frame 131 of the back support 130 is provided with a recess 131a that opens outward and downward in the left-right direction, and a vertical direction that opens in the left-right direction on the back wall 131b of the recess 131a. Opening 131c is provided.
  • Bolt insertion holes 131d and 131e are formed above and below the opening 131c in the recess 131a.
  • a pair of left and right bolt insertion holes 132 a in the vertical direction are also formed in the horizontal frame 132 on the inner side in the horizontal direction than the connection recess 133.
  • the inner shell 110 is placed on the backrest support 130 attached to the backrest support frame 77 from above, and the standing frame 131 of the backrest support 130 is placed in the recess 117a provided with the openings 117 at the left and right lower portions thereof. Are arranged so as to be fitted (see FIG. 21).
  • the nut housing portions 111 e and 111 f that are prevented from rotating provided at the side edge portion 111 of the inner shell 110, and the nut housing portion that is prevented from rotating provided at the lower edge portion 113.
  • the bolts 131d1, 131e1, 132a1 are respectively inserted into the bolt insertion holes 131d, 131e, 132a in the backrest support body 130 shown in FIG. 27, and then the bolt insertion holes 118a, 118b (see FIG. 27) of the inner shell 110, the bolts.
  • the inner shell 110 is firmly attached to the backrest support 130 by being inserted into the insertion notches 113b (see FIG. 22) and fastened to the nuts 131d2, 131e2, and 132a2, respectively.
  • a cover member 140 is attached to the recess 131 a of the standing frame 131 in the back support 130. As shown in FIGS. 23 and 27, the cover member 140 has a shape in which the lower part is curved inward and downward in the left-right direction when viewed from the front, extends upward at the upper end 141, and extends inward in the left-right direction at the lower end.
  • a lower locking portion 142 having a downward locking claw 142a is provided.
  • the upright portion of the cover member 140 is provided with a vertical opening 143 that opens in the left-right direction.
  • FIG. 28 is an enlarged view showing a form in which the gripping member 240 is attached to the cover member 140, (a) is a perspective view before assembling, and (b) is a perspective view showing the assembled state.
  • cover member 140 is broken and shows only a part.
  • the inner end of the opening 143 in the left-right direction has a pair of inward facing toward the inner side in the front-rear direction in the upper half portion.
  • a piece 144 is provided.
  • the gripping member 240 coupled to the operation support portion 220 of the lumbar support 200 includes a gripping material 241 and a connecting bracket 242 as shown in FIGS.
  • the gripping material 241 includes a gripping portion 241 a that is gripped when a seated person adjusts the vertical position of the lumbar support 200, and an inward projecting piece 241 b for connecting the gripping material 241 to the connection fitting 242.
  • the connecting fitting 242 has a horizontally long plate shape when viewed from the front, a circular protrusion 242a is provided in the center, and a rectangular through hole 242b is provided in the vicinity of the free end.
  • the inwardly projecting piece 241b in the gripping material 241 has an insertion hole 241c into which the connecting fitting 242 can be inserted at the free end thereof, and has a horizontal rectangular shape when viewed from the front.
  • the inward projecting piece 241b has a base plate thickness portion 241d and a plate thin portion 241e that becomes thinner from the plate thickness portion 241d with a stepped portion, and the plate thin portion 241e also has a plate.
  • a plate thickness small portion 241f is provided in the lower half portion except for the vicinity of the thick portion 241d.
  • a vertical groove portion 241g is formed between the plate thickness portion 241d and the plate thickness small portion 241f. Yes.
  • the thickness W1 of the plate thickness portion 241d and the plate thickness small portion 241f is slightly smaller than the width W3 of the opening 143 of the cover member 140, and larger than the width W4 between the edges of the inward piece 144 of the opening 143.
  • the thickness W2 of the thin plate portion 241e is slightly smaller than the width W4 between the edges of the inward piece 144.
  • the vertical dimension of the small thickness portion 241f is slightly smaller than the vertical dimension of the lower opening 143a having an opening width W3 formed below the inward piece 144 of the opening 143.
  • a circular hole 241h is formed in the small thickness portion 241f.
  • connection fitting 242 By inserting the base of the connection fitting 242 into the insertion hole 241c provided at the free end of the holding member 241, and fitting the circular protrusion 242a of the connection fitting 242 into the circular hole 241h of the holding member 241, As shown in FIG. 28, the connecting fitting 242 is connected to and integrated with the gripping material 241 to form a gripping member 240.
  • the gripping member 240 is inserted into the opening 143 of the cover member 140 from the outside in the left-right direction, and the plate thickness small portion 241f of the gripping member 240 is passed through the lower opening 143a of the cover member 140, so that FIG. As shown in FIG. 3, when the gripping member 240 is moved upward so that the inward piece 144 is fitted to the groove portion 241g, the gripping member 240 does not fall off the cover member 140 outward in the left-right direction. (See FIG. 37).
  • the cover member 140 with the gripping member 240 attached thereto is attached to the recess 131a in the standing frame 131 of the backrest support 130 as follows.
  • a locked portion (not shown) that can lock the upper locking portion 141 of the cover member 140 is provided on the upper portion of the recess 131a, and a lower locking of the cover member 140 is provided on the lateral frame 132 of the back support 130.
  • Locked portions (not shown) that can lock the portions 142 are provided, and the gripping member 240 is fitted by fitting the cover member 140 into the recess 131a of the backrest support 130 from the outside in the left-right direction. The inserted cover member 140 is attached to the backrest support 130.
  • the mounting means for attaching the grip member 240 to the cover member 140 and the attaching means for attaching the cover member 140 to the backrest support 130 have been described in detail.
  • slidable contact protrusions 224 protruding from the rear surface of the operation support portion 220 are slidable contact surfaces 111g provided on the inner side in the left-right direction with respect to the opening portions 117 at the left and right side portions of the lower portion of the inner shell 110.
  • the lumbar support 200 comes into sliding contact with the vertical movement.
  • the slidable contact surface 111g has a wavy shape in a side view so as to include a plurality of engaged portions with which the slidable contact protrusions 224 engage and disengage (see FIGS. 26 and 35).
  • the guide support portions 210 provided on the left and right sides of the upper portion of the lumbar support 200 can be supported from the front by the guide portions 121 of the guide member 120 so that the guide members 120 are supported on the left and right side edges of the inner shell 110. It attaches to the recessed part 111b provided in the part 111. FIG.
  • the guide support part 210 is supported by the guide member 120 so as not to be detached and movable in the vertical direction (see FIG. 34).
  • the guide protrusion 116 provided on the inner shell 110 is inserted into the sliding contact groove 230a of the sliding contact portion 230 provided on the upper and lower portions of the rear surface of the lumbar support 200.
  • the sliding contact portion 230 slides and moves substantially along the shape of the front edge portion of the guide protrusion 116 in a side view as the lumbar support 200 moves in the vertical direction.
  • the guide protrusion 116 includes an upper sliding contact portion 116a in which the upper sliding contact portion 231 of the lumbar support 200 is slidably contacted and a lower sliding contact portion in which the lower sliding contact portion 232 is slidably contacted. 116b.
  • the front edge portion of the upper slidable contact portion 116a or the lower slidable contact portion 116b in a side view gradually moves forward from the lower end portion of the upper slidable contact portion 116a or the lower slidable contact portion 116b toward the upper end portion. It has a shape that protrudes toward the center.
  • the backrest 100 has a shape in which a waist support portion 100a that supports the waist of a seated person projects most forward in a side view (see FIG. 20), and the guide protrusion 116 is a part of the waist support portion 100a or It is provided in the vicinity thereof, and the vertical position of the lower end portion of the upper sliding contact portion 116a or the upper end portion of the lower sliding contact portion 116b is substantially equal to the position of the waist support portion 100a of the backrest 100. . Further, the front edge portion of the guide protrusion 116 in the side view is located behind the guide member 120.
  • a bag-shaped skin material 160 having a lower end formed in advance in a backrest shape is opened from above.
  • the lower end of the skin material 160 is tacked to the lower edge portion 112 of the inner shell 110 from below.
  • notches 160a aligned with the openings 117 on the left and right sides of the inner shell 110 are provided.
  • the inner shell 110 of the backrest 100 covered with the skin material 160 is attached to the backrest support 130.
  • the free end of the connection fitting 242 in the gripping member 240 is inserted into the insertion port 220 a of the operation support portion 220, and the cover member 140 is attached to the backrest support 130. Then, it is fitted into the recess 131a of the standing frame 131 and attached.
  • the backrest 100 to which the lumbar support 200 is attached is firmly attached to the backrest support 130 attached to the backrest frame 7.
  • each member including the inner shell can be changed to an appropriate different form.
  • the front edge portion in the side view of the guide ridge provided for the backrest is located in front of the guide member also provided for the backrest, or in the guide ridge provided in the inner shell

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
PCT/JP2012/078455 2011-11-04 2012-11-02 椅子 WO2013065816A1 (ja)

Priority Applications (3)

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CN201280054034.8A CN104023593B (zh) 2011-11-04 2012-11-02 椅子
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US9155393B2 (en) 2015-10-13
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CN104023593A (zh) 2014-09-03
EP2774512A4 (en) 2015-07-01
EP2774512B1 (en) 2017-07-05

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